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Welcome to AX84® the base camp for tube (valve) electronics hobbyists.

AX84 exists to provide:

1) A great environment to learn about music-related electronics in general. AX84 is a place where those with experience are interested in helping diligent beginners who are willing to do their homework.

2) A place where those with more experience can field their ideas to peers and get useful feedback.

3) An environment that respects the past, but is not enslaved by it. INNOVATION IS GOOD (and it didn't die in the 1950s.) There are new things under the sun every day. Move the ball forward!

Our HUGE discussion area is under 'Discussion Forum' to your left.

We are hard at work improving the site- check back often!

Recent Forum Threads
"Class A tone variance"
Posted By GeraldHinson on 09/30/2014
I've been studying Class A (specifically single tube) vs. push-pull (with 2 tubes) amps of late. I own a Carr Mercury, which is a pretty nice example of the former. Originally I was trying to unders...

Discuss this entry
"marshall super bass"
Posted By GeraldHinson on 09/30/2014
I was looking at some of the old marshall circuits recently as a result of being wow'ed by a ash strat played through a 1970 Marshall Super Bass. From what I can tell the super bass is almost identica...

Discuss this entry
"Question about OT impedances"
Posted By Henrik Lidbjrk on 09/30/2014
I have this weird little "on-on-on" DPDT 3-way switch, which switches between positions 1 = A+a, 2 = B+b, and 3 = A+b.

Before I found out how weird it is, I was intending to use it as an output tra...

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"Octal preamp project"
Posted By JeffW on 09/29/2014
Here are some pics and a schematic for my latest project. Started out cleaning up my bench and work area and ended up with a cool little amp :)


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"High end loss in my effects loop"
Posted By bubbab74 on 09/29/2014
So I built an effects loop into an amp of mine and it sends and receives a good level, but there's still some high freq. loss with pedals inline, two 20' cables engaged.

Here's how it's wired up: ...

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Updates: Wed, Oct 01st, 2014 @ 12:07:05
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Site News

2012-2-25: Winter is almost over. What's on your workbench?

2011-10-10: Some good discussions about LTSpice in the forums again, as well as suggestions on what all to do to a P1-eXtreme.

2011-10-10: What all can you do with a P1-extreme? check the forum

2011-10-7: Don't forget to like us on Facebook!

2011-08-11: Posted some Single-Ended Lead clips in the Classic Amp Projects->SEL section. Hundreds built but now we've got clips. Check out the archived projects section for more clips.

2010-10-22: Be sure to check out our discussion forum using the link on the left..

2009-07-01: The Treasure Fleet is on the way to Rio De La Hacha with a fortune in gold!

We're looking for media clips of recent builds... please stop by the forum and respond to the thread.

2008-10-4: Archived Projects section is functional again.

2008-9-18: RSS Feeds for the forum have been up for a while, but not advertised...
* Active Threads
* New Threads
* Recent Posts

2008-6-26: Want to participate in our discussion forums? You are welcome to read and lurk as you like. If you think you'd like to post with regularity, please sign up for an account.

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